Why do we Yawn
Considering this news, you probably yawn. Why do we yawn and why? This question asked by many. Yawning - a breathing motion, often involuntary, consisting of a deep breath and exhale vigorously.
Yawn not unique to man. They say that even a frog yawn. Yawning is a reflection of the ancient instinct that has existed in all animals. People are able to empathize, to see people yawning, too, begin to yawn. Yawning - employment is extremely contagious. Yawn for the company in 42-50% of cases, but this action can not be children under four years. Chimpanzees, like humans, are able to yawn for the company.

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